Check Of Density Limit - Panasonic U-72MF1U9 Installation Instructions Manual

When Servicing
• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical
parts and wiring.
• Keep your fi ngers and clothing away from any moving
parts.
• Clean up the site after you fi nish, remembering to check
that no metal scraps or bits of wiring have been left
inside the unit being serviced.
• Do not clean inside the indoor and
WARNING
outdoor units by users. Engage
authorized dealer or specialist for
cleaning.
• In case of malfunction of this
appliance, do not repair by yourself.
Contact to the sales dealer or service
dealer for a repair.

Check of Density Limit

The room in which the air conditioner is to be
installed requires a design that in the event of
refrigerant gas leaking out, its density will not
exceed a set limit.
The refrigerant (R410A), which is used in the air
conditioner, is safe, without the toxicity or combustibility
of ammonia, and is not restricted by laws imposed to
protect the ozone layer. However, since it contains more
than air, it poses the risk of suffocation if its density
should rise excessively. Suffocation from leakage of
refrigerant is almost non-existent.
With the recent increase in the number of high density
buildings, however, the installation of multi air
conditioner systems is on the increase because of the
need for effective use of fl oor space, individual control,
energy conservation by curtailing heat and carrying
power, etc.
Most importantly, the multi air conditioner system is able
to replenish a large amount of refrigerant compared to
conventional individual air conditioners. If a single unit of
the multi air conditioner system is to be installed in a
small room, select a suitable model and installation
procedure so that if the refrigerant accidentally leaks
out, its density does not reach the limit (and in the event
of an emergency, measures can be made before injury
can occur).
• Do not touch the air inlet or the
CAUTION
sharp aluminum fi ns of the
outdoor unit. You may get injured.
• Ventilate any enclosed areas when
installing or testing the refrigeration
system. Escaped refrigerant gas, on
contact with fi re or heat, can produce
dangerously toxic gas.
• Confi rm after installation that no
refrigerant gas is leaking. If the gas
comes in contact with a burning stove,
gas water heater, electric room heater
or other heat source, it can cause the
generation of poisonous gas.
Others
• Do not touch the air inlet or the
CAUTION
sharp aluminum fi ns of the
outdoor unit. You may get injured.
• Do not sit or step on the unit,
you may fall down accidentally.
• Do not stick any object into the
FAN CASE.
You may be injured and the unit
may be damaged.
ASHRAE and the International Mechanical Code of the
ICC as well as CSA provide guidance and defi ne
safeguards related to the use of refrigerants, all of which
defi ne a Refrigerant Concentration Level (RCL) of 25
pounds per 1,000 cubic feet for R410A refrigerant.
For additional guidance and precautions related to
refrigerant safety, please refer to the following
documents:
International Mechanical Code 2009 (IMC-2009)
(or more recently revised)
ASHRAE 15
ASHRAE 34
3